SEER is an authoritative source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 28 percent of the U.S. population.

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HPF:

Localized/Regional/Distant Stage Adjustments

The SEER Program strives to make all Localized/Regional/Distant stage variables consistent for all cancer sites for the appropriate years. However, there are certain site/year combinations where this is not possible. The following tables detail changes imposed on the SEER Historic and Summary stage variables for each SEER Research Data release.